We are restoring a water mill and have recently got our 2 wheels turning once more. One of them is connected to an existing 3phase 10KVa alternator which although a little old seems to be in good condition. It spins and we achieve around 49.5Hz (- more to come when the river rises).
However the expected phase to neutral of c230v is only between 10 and 12. We have been advised this is because as it has stood still for a number of years it has lost much of its magnetism. We are also told this is an easy fix with a DC source and a couple of pieces of wire.
We appear to have 6 connections (3 phase, 1 neutral and 2 voltage adjusters that are connected to a remote rheostat).
Could someone tell us how to get this back to life?
Links to some photos: !http://moulin2roues.com/projects/alternator/Alternator-brushes.jpeg !http://moulin2roues.com/projects/alternator/Alternator-connection-box.jpeg !http://moulin2roues.com/projects/alternator/Alternator-connections.jpeg !http://moulin2roues.com/projects/alternator/Alternator-nameplate.jpeg